Not until all the fish died in the lake __________ how serious the pollution was.
They ______ so tired if they ______ for a whole day.
Do you consider it any good _____ the truck again ?
If you find yourself ______ no one will help you, please call me.
— Why does the lake smell terrible? — Because large quantities of water______.
What you told me the other day is really true,_______?